Apparatus for coating metal strips



Jun 18, 1935. I T. D, WILLIAMS 2,005,307

APPARATUS FOR COATING METAL STRIPS Filed April 11, 1953 2 sheets-sheen 1 Fgz [maf/([077 HO/VS D. WiL/HMS June 18, 1935. T D W|| |AM$ 21,005,307

APPARATUS FOR COATTNG METAL STRIPS Filed April ll, 1933 2 Sheets-She'et 2 [mw/daf: XQG/was Mum/M5,

Patented June 18, 1935 UNITED STATES 2,005,307 APPARATUS FOR COATING METAL STRIPS Thomas D. Williams, Garfield Heights,r Ohio,

assigner to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Application April 11, 1933, Serial No. 665,618

1 Claim. (Cl. 91530) This invention relates to an apparatus for coating metal strip, and more particularly to coating flat strip steel or other shapes which have previously been lacquered or varnished.

One object oi the present invention is the provision of a novel apparatus for coating previously lacquered or varnished and baked metal strip with liquid wax or other suitable coating material, in such manner as to provide an additional moisture repellent medium, and a qstrip with a harder and smoother iinish.

Another object is the provision of a novel `method and apparatus for coating continuously fed metal strip with determined quantities of coating liquid at determined intervals, together with means for evenly distributing the coating and removing the surplus.

'I'hese and further objects will appear after referring to the drawings, in which:

Figure 1 is a plan of the apparatus of the invention.

Figure 2 is a side elevation thereof.

Figure 3 is a sectional elevation of the improved coating material dispensing apparatus of the invention.

Figure 4 is a sectional View of of Figure 3.

Figure 5 is a sectional view of the line V-V of Figure 3.

25 Referring more particularly to the drawings, the numeral 2 designates a bed over which metal the line IV-IV strip A is continuously fed from the baking furnace of a conventional lacquering or varnishing apparatus (not shown). A cylindrical stationary 30 shell 3 is mounted transversely of the bed 2 land provided with dispensing apertures -31L which are positioned immediately above the metal strip A. A rotary shell 4 is journaled in'the stationary shell 3 and provided with a plurality of apertures 4L which are adapted to be alined with the dispensing apertures 3a in the stationary shell 3, and a feed orice 5.

A ratchet 6 is secured to the rotary shell 4 and a rocking lever 1 journaled thereon. A pawl 'Ia is mounted on the rocking lever 1 for engaging the ratchet E. A motor 8 is mounted on the bed 2 for driving a gear reducing unit 9 which is provided with a crank I. A connecting-,rod I2 is connected to the crank I0 at one of its ends and provided with a sliding crank pin I4 which is adjustably connected to the rocking'lever 1.

A suitably heated storage tank I5, for containing liquid wax or parain or other coating material, is disposed adjacent the stationary cylindrical shell 3 and provided with a feed pipe I6 and adjusting valve II=L for supplying the latter with Vthe material at a point accessible to the feed orice 5 in the rotary shell 4. A steam pipe l1 is internally disposed throughout the length of the rotary shell 4 for maintaining the coating liquid in so-lution'and at the proper temperature.

A pair of Wipers I9 is mounted transversely of the bed 2 on either side of the metal strip A and in contact therewith, and a drip pan 20 disposed beneath the Wipers, and a substantial portion of the bed, for returningi surplus coating liquid through a conduit 2I to the storage tank I5.

In operation, metal strip A is continuously fed over the bed 2 as it emerges from the baking furnace (not shown) and the motor 8 continuously operated to reciprocate the rotary shell 4. The coating iiuid from the tank I5 will flow through the feed pipe IE and collect in the rotary shell 4, due to the periodic alinement of the feed orifice 5 with the feed pipe. As the rotary shell rotates, the apertures Ia therein will aline with the dispensing apertures 3a in the stationary cylindrical shell 3, permitting the coating liquid to drip on the strip A as it moves across the bed. As the strip progresses between the wipers I9 the coating liquid will be evenly distributed and the surplus caused to drop into the drip pan 2D and return through the conduit 2I to the storage tank I5.

The sliding crank pin I4, due to its adjustment relative to the rocking lever 1, and the liquid supply adjusting valve ISE, provide for effective regulation of the apparatus.

While I have shown and described one specific y embodiment of my invention, it will be understood .that I do not wish to be limited exactly thereto,

since various modifications may be made without departing from the scope of my invention, as defined in the following claim.

I claim:

Apparatus for coating metal strip comprising a stationary cylindrical shell having a plurality of dispensing apertures, a coating material supply conduit for said stationary cylindrical shell, a rotary shell journaled in said first named shell and having a plurality of apertures adapted for periodic alinement with said dispensing apertures and at least. one feed orifice adapted for periodic alinement with said coating material supply conduit, a ratchet secured to said rotary shell, a rocking lever journaled on said last named shell and having a pawl for engaging said ratchet, a connecting-rod adjustably secured to said rocking lever, means for reciprocating said connectingrod, means for evenly distributing the coating ma-` terial from said dispensing apertures on said metal stripand removing the surplus therefrom,

a coating material storage container for said supply conduit, and means for returning the surplus coating material to said storage container.

THOMAS D. WILLIAMS, 

